So you think he was using or dealing meth?
Everyone describes as an upstanding guy, who had a lot of knowledge over medicine and chemistry. No evidence of him having ever been a user of anything....really clean background for his entire life. Maybe if you had some master plan to make a huge batch and you needed a smart guy to manufacture it...he might fit into this type of plan.
Course, maybe he had some nutcase gal who came up to kidnap him. Odd thing is that the house does not appear to be robbed, and the only factor to suggest a break-in is a window left open on one end of the house. Beyond that....nothing to say some other individual was visiting or waiting for him. If he were sick...bad off...maybe a friend would have picked him up and carried him to a hospital but he would taken his keys and billfold.
I cannot picture him using meth. That stuff messes with your head way too much, and he’s far too intelligent to get involved with it. You don’t get where he got without having certain life goals, and people who use meth don’t typically have goals such as he achieved.
I also can’t picture him dealing meth. It just doesn’t make sense.